An equidigital number is a positive integer 
whose prime
factorization, including its written exponents,
contains the same number of decimal digits as 
itself. Exponents
equal to 1 are omitted, and the representation 1 is used for 
. The first few equidigital numbers are 1, 2, 3, 5, 7, 10,
11, 13, 14, 15, 16, 17, 19, 21, 23, ... (OEIS A046758).
Equidigital Number
See also
Economical Number, Wasteful NumberExplore with Wolfram|Alpha
References
Pinch, R. G. E. "Economical Numbers." 9 Feb 1998. https://arxiv.org/abs/math/9802046.Santos, B. R. "Problem 2204. Equidigital Representation." J. Recr. Math. 27, 58-59, 1995.Sloane, N. J. A. Sequence A046758 in "The On-Line Encyclopedia of Integer Sequences."Referenced on Wolfram|Alpha
Equidigital NumberCite this as:
Weisstein, Eric W. "Equidigital Number." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/EquidigitalNumber.html